Think of Baggage files as a simple way to include content that the help system may not be aware of. Imagine going on a trip with a child. Perhaps you are traveling to the beach. The child may need a large umbrella to keep shaded. You know this, but the child doesn't. So you toss a big umbrella in the trunk of the car. When you get to the beach, you now have access to the umbrella because it is in the trunk. The same holds true for RoboHelp and Baggage.
Cheers... Rick